Nailor 37S Manual page 31

CONTROLLER/ACTUATOR
DAMPER
CW TO
CLOSE
BALANCING
TEES
16
V
DC
24" (610)
LENGTH
1/4" (6) O. D.
TUBING TO
DIAMOND
FLOW
SENSOR
FACTORY
WIRING/PIPING
FIELD WIRING
CONTROL SEQUENCE A3
COOLING WITH ELECTRIC HEAT (CONTINUOUS OPERATION)
Sequence of Operation:
Fan runs continuously, providing constant volume to the space. With room
temperature at set point, unit delivers minimum cooling airflow and maximum
induced plenum air. On a rise in room temperature, the thermostat regulates the
controller/actuator to increase primary airflow.
As more cold air is supplied to the fan section, less warm air is induced from the
ceiling plenum.
When the room temperature exceeds the setpoint by 2°F (1.1°C) or more, primary
airflow is maintained at the maximum setting. The maximum setting is usually the
same as the total fan volume setting.
On a decrease in room temperature, the thermostat regulates the
controller/actuator to decrease the airflow and as less cold air is supplied to the
fan section, more warm air is induced from the ceiling plenum. If room
temperature continues to drop, minimum primary airflow is maintained and at
0.8°F (0.4°C) below setpoint, the first stage of electric heat is energized. The
optional second heat stage is energized at 1.6°F (0.9°C) below setpoint.
An increase in room temperature de-activates the heat stages at 1.2°F and 0.4°F
(0.7°C and 0.2°C) below setpoint.
Primary airflow is held constant in accordance with thermostat demand. Any
changes in duct air velocity due to static pressure fluctuations are sensed and
compensated for, resulting in pressure independent control.
(Minimum and maximum primary airflow limits are adjusted underneath the
thermostat cover).
SCHEDULE TYPE:
PROJECT:
ENGINEER:
CONTRACTOR:
Nailor Industries Inc. reserves the right to change any information concerning product or pricing without notice.
ANALOG ELECTRONIC CONTROL
FAN POWERED TERMINAL UNIT • SERIES FLOW
CONSTANT VOLUME • PRESSURE INDEPENDENT
MODELS: 35SE, 35SEST, 37SE AND 37SEST A3
CSP-5002
V
N M M
N
O A I O
I O – –
R X N M
N U 24V
M
A
METER
T AC
X
%
RED-CLS
M
GRN-OPN
I
N
C
LED
L
O
CCW CW
S
E
CTE-5101 ROOM THERMOSTAT (DA)
SINGLE TEMP. SET POINT
12
V1 T3 R1 T1 + V A –
TERMINAL
V1 T3 T1 + –
BLOCK
GROUND
ELECTRIC HEAT CONTACTORS
24 VAC – 10 VA MAX. PER STAGE
1
2
REE-5002
REHEAT RELAY MODULE
NOTE:
Constant volume series terminal fans should
be interlocked to be energized ahead of or
when the central system fan starts, to prevent
backflow of primary air into the ceiling plenum
and to prevent possible backward rotation of
the terminal fan.
Options:
Thermostat Scale Plate:
(Thermostat includes backing plate for 2" x 4"
electrical box).
STAGE
TWO
MINIMUM
COLD
- 2°F
(-1.1°C)
DATE
8 - 6 - 08
LINE
VOLTAGE
N H
TOGGLE
DISCONNECT
SWITCH
(OPTIONAL)
SPEED
CONTROLLER
24 VAC
TRANSFORMER
CAPACITOR
FAN
MOTOR
❑
°F or
TOTAL AIRFLOW
MIXING
STAGE
ONE
SETPOINT
ROOM TEMPERATURE INCREASE
B SERIES SUPERSEDES DRAWING NO.
3500 12 - 2 - 02
❑
°C
MAXIMUM
COOLING
HOT
+ 2°F
(+1.1°C)
35SECD-A3